Novena EVT to DVT changes

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Revision as of 09:27, 19 March 2013 by Bunnie (talk | contribs) (Inrush current limit)
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Novena EVT to DVT changes

This is a list of all the changes applied to the board from EVT1A to DVT1 release. If it's not on this list, it didn't happen.

Each change has the format of issue summary/resolution, and specific change

Inrush current limit

The RC constant governing the turn-on/turn-off rates of the FET power switches needs tuning. In EVT, most switches are turning on too quickly for them to be effective. Resolution is to increase capacitance and resistance.

EVT DVT Notes
R38N 330, 1% / REC1005N R38N 10k, 1% / RESC1005N P3.3V_DELAYED
C30N 0.1uF, 6.3V, X5R / CAPC0603N_B C30N 1.0uF, 25V, 20% X5R 0201 / CAPC0603N_B P3.3V_DELAYED
R29N 330, 1% / REC1005N R29N 10k, 1% / RESC1005N P5.0V_DELAYED
C27N 0.1uF, 6.3V, X5R / CAPC0603N_B C27N 1.0uF, 25V, 20% X5R 0201 / CAPC0603N_B P5.0V_DELAYED
R11H 330, 1% / REC1005N R11H 10k, 1% / RESC1005N SATA_PWRON
C10H 0.1uF, 6.3V, X5R / CAPC0603N_B C10H 1.0uF, 25V, 20% X5R 0201 / CAPC0603N_B SATA_PWRON
C10X 0.1uF, 6.3V, X5R / CAPC0603N_B C10X 1.0uF, 25V, 20% X5R 0201 / CAPC0603N_B PCIE_PWRON
R15L 1k, 1% / REC1005N R15L 10k, 1% / RESC1005N LCD_VCC_SW
C14L 0.1uF, 6.3V, X5R / CAPC0603N_B C14L 1.0uF, 25V, 20% X5R 0201 / CAPC0603N_B LCD_VCC_SW
C19L 0.1uF, 25V, X5R / CAPC1005N C19L 1.0uF, 25V, 20% X5R 0201 / CAPC0603N_B LCD_BL_VDD


  • R12F to DNP, R13F to 4.7k, 1% 0402 (resolve boot fuse issue with FPGA pull-ups)
  • remove C32G, D12G, R20G, D11G; short across D12G with wire jumper or 0805 resistor, 0 ohm (resolve gbit ethernet reset issue)
  • remove R11X, tie gate of Q10X to P3.3V_DELAYED (off of pin 2 of Q11X) (resolve PCIE power on issue)
  • remove R14G (possibly resolve magnetics termination issue)
  • replace R21G with 0-ohm resistor or shunt (partially resolve Gbit refclock stability issue)
  • move R28L to R27L (HDMI HPD swap)
  • add Q17L (HDMI HPD swap)
  • add R29L (HDMI HPD swap)
  • change R21A from 100 ohms to 10 ohms
  • APX803-44SAG-7 added, monitoring the P5.0V line, and pulling down the RESETBMCU line.
  • probably all instances of RC timing for power switches need to be improved (see 10k/1uF patch)
  • add 2.2k resistor in shunt with input capacitor network (BATT_PWR to ground)
  • Cut ALRCK trace to U11A, and jumper pin 9 of U11A to LCD_BL_ON
  • Rewire LCD_BL_ON to a new GPIO on the i.MX6 (final GPIO TBD)
  • Connect PICE_PWRON to i.MX6 (final GPIO TBD)